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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Don Allen modified magnavox tube amp help posted by AstromanoftheFuture on May 23, 2016 at 12:16:05:
Astroman,This has gotten even more interesting. ;>) It appears that Mr. Allen started with a Magnavox model 9302 and, among other things, added some line stage circuitry that uses an additional tube.
You stated you want 2 sources: phono and digital. It is possible to install a tubed phono preamp on the chassis, without adding to the 3 bottle small signal complement. Please notice that the power transformer has a 2nd, currently unused, filament winding that was used to energize the tuner/preamp. That winding can be repurposed to feed a DC heater supply, for the phono section heaters. The phono preamp uses 2X 12AX7s, which leaves but 1 twin triode for the power section. That is gotten around by using the ZVN0545A MOSFET in a "concertina" phase splitter role.
What I have in mind is to use a tweaked RCA setup for phono and hybrid variation on the Dyna ST35 theme.
You can have exactly what you want. :>D
Eli D.
Edits: 05/29/16
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Follow Ups
- RE: Don Allen modified magnavox tube amp help - Eli Duttman 20:55:59 05/28/16 (2)
- Some Schematics - Eli Duttman 20:59:08 05/28/16 (1)
- RE: Some Schematics - AstromanoftheFuture 00:28:38 05/29/16 (0)
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